What I find interesting is the type of applications and senario's being demonstrated in these videos (particulalry the US Navy stuff from 1942) as contrasted with the comparative timelines with Funakoshi and the development of Shotokan in Japan...

Many of these techniques come from catch as catch can wrestling. My father was a hand to hand combat instructor during WWII. He taught RAF and U.S. Army Air Corps pilots after he was shot down himself twice and due to his injuries was grounded. He taught me several of these techniques and told me of their origins.